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CVE-2026-39828

Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh

Published: May 22, 2026Updated: Jun 2, 2026 Sources: CVE List NVDCWE-295
NVD MITRE
6.3CVSSMEDIUM
EPSS Score
0.2%
Top 93.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError now results in a connection error.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-295

Affected Products

cryptogolangOSS Libraries
golang.org/x/crypto/sshgolang.org/x/crypto
Library
OSS Libraries / go
golangoss-projectUSOSS Libraries
golang.org/x/cryptooss-projectOSS Librariesaka x/crypto, golang x crypto

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://go.dev/cl/781621
go.dev
https://go.dev/issue/79562
go.dev
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
groups.google.com
and 1 more references View all →

Timeline

Published
May 22, 2026
Last Updated
Jun 2, 2026

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